A few advertisers are utilizing web publicizing and are bringing a bunch of new clients, however, it has a few confinements - you can contact the general population who make use of a laptop or PC, but you can't reach everybody. This is one of the reasons for the growth of bulk SMS marketing. However, these Bulk SMS cannot be sent just from phones as there will be quite some problem if you try to achieve the target in this way.
In fact, there are certain specific Bulk SMS Service Provider companies out there. You need to get access to such companies or work with them in order to utilize bulk SMS marketing services.